/*
 * MIT License
 *
 * Copyright (c) 2025 Mark·虎
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 *
 */

package com.hsxxherp.key.support.sys.file;

import com.hsxxherp.key.support.sys.entity.SysFileInfo;
import com.hsxxherp.key.support.sys.service.IFileInfoService;
import org.apache.commons.net.ftp.FTP;
import org.apache.commons.net.ftp.FTPClient;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Service;
import org.springframework.web.multipart.MultipartFile;

import java.io.IOException;
import java.io.InputStream;
import java.time.LocalDateTime;
import java.time.temporal.ChronoUnit;
import java.util.UUID;

@Service("ftpFileStorageService")
public class FtpIFileStorageService implements IFileStorageService {

    @Value("${file.ftp.host}")
    private String ftpHost;

    @Value("${file.ftp.port}")
    private int ftpPort;

    @Value("${file.ftp.username}")
    private String ftpUsername;

    @Value("${file.ftp.password}")
    private String ftpPassword;

    @Value("${file.temp.expire-time}")
    private long tempExpireTime;

    @Autowired
    private IFileInfoService fileInfoService;

    @Override
    public String saveFile(MultipartFile file, boolean isTemp) throws IOException {
        String fileName = UUID.randomUUID().toString() + "_" + file.getOriginalFilename();
        FTPClient ftpClient = new FTPClient();
        try {
            ftpClient.connect(ftpHost, ftpPort);
            ftpClient.login(ftpUsername, ftpPassword);
            ftpClient.enterLocalPassiveMode();
            ftpClient.setFileType(FTP.BINARY_FILE_TYPE);

            InputStream inputStream = file.getInputStream();
            boolean success = ftpClient.storeFile(fileName, inputStream);
            inputStream.close();

            if (success) {
                SysFileInfo fileInfo = new SysFileInfo();
                fileInfo.setFileName(fileName);
                fileInfo.setFilePath(ftpHost + "/" + fileName);
                fileInfo.setTemp(isTemp);
                fileInfo.setCreateTime(LocalDateTime.now());
                if (isTemp) {
                    fileInfo.setExpireTime(LocalDateTime.now().plus(tempExpireTime, ChronoUnit.SECONDS));
                }
                fileInfoService.save(fileInfo);

                return ftpHost + "/" + fileName;
            }
        } finally {
            if (ftpClient.isConnected()) {
                ftpClient.logout();
                ftpClient.disconnect();
            }
        }
        return null;
    }

    @Override
    public void deleteTempFiles() {
        // 实现 FTP 临时文件删除逻辑
        // 这里只是简单示例，实际中需要根据 FTP 操作删除文件并更新数据库
        LocalDateTime now = LocalDateTime.now();
        fileInfoService.lambdaQuery()
                .eq(SysFileInfo::isTemp, true)
                .lt(SysFileInfo::getExpireTime, now)
                .list()
                .forEach(fileInfo -> {
                    // 连接 FTP 删除文件
                    FTPClient ftpClient = new FTPClient();
                    try {
                        ftpClient.connect(ftpHost, ftpPort);
                        ftpClient.login(ftpUsername, ftpPassword);
                        ftpClient.enterLocalPassiveMode();
                        ftpClient.deleteFile(fileInfo.getFileName());
                        fileInfoService.removeById(fileInfo.getId());
                    } catch (IOException e) {
                        e.printStackTrace();
                    } finally {
                        if (ftpClient.isConnected()) {
                            try {
                                ftpClient.logout();
                                ftpClient.disconnect();
                            } catch (IOException e) {
                                e.printStackTrace();
                            }
                        }
                    }
                });
    }
}